clinging is one condition
becoming is another condition
there is three types of becoming
"And what is becoming? These three are becomings: sensual becoming, form becoming, & formless becoming. This is called becoming.(non becoming is a type of craving)
there is four types of clinging.
"And what is clinging/sustenance? These four are clingings: sensuality clinging, view clinging, precept & practice clinging, and doctrine of self clinging. This is called clinginghttp://www.accesstoinsight.org/tipitaka ... .than.html
what do you mean when you say clinging of becoming?
here in this depending origination explination
it covers only craving for sense becoming( the six types of craving)
it does not cover other types of craving
as in the sutta Dhammacakkappavattana
which cover craving in more detail.
the craving that makes for further becoming — accompanied by passion & delight, relishing now here & now there — i.e.,
craving for sensual pleasure, craving for becoming, craving for non-becoming.
it is the same craving that when not abandon gives rise to suffering
it is the same craving that when abandon ends suffering
and what craving that is not abandon, it is the craving that makes for further becoming, accompanied by passion,delight,relishing now here, now there.
and with remainders cessation of craving, the unarisen does not arise (clinging) and when there is not of this clinging, there is not of this becoming,
and arisen is abandon (craving), and wit remaindless cessation of the craving, there is cessation of the clinging.
here is why the cessation is often refers to unbinging