It's uncool when rowdy steals a kiss (10)

'kiss' is the definition.
(I know that kiss can be written as osculation)

'it's uncool when rowdy steals a' is the wordplay.
I cannot quite see how this works, but
'when' could be 'on' (I've seen this in other clues) and 'on' is found within the answer.
'a' is within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?