Overbearing pop singers must reform (10)
I believe the answer is:
oppressing
'overbearing' is the definition.
Although both the answer and definition are present participle verbs, I can't understand how one could define the other.
'pop singers must reform' is the wordplay.
'must reform' indicates an anagram (I've seen this in other clues).
'pop'+'singers'='popsingers'
'popsingers' is an anagram of 'OPPRESSING'.
Can you help me to learn more?
(Another definition for oppressing that I've seen is " overpowering!".)