Old lover in affair showing some muscle? (7)
I believe the answer is:
flexing
'showing some muscle?' is the definition.
The answer and definition can be both to do with motion as well as being present participle verbs.
Maybe they are linked in a way I don't understand?
'old lover in affair' is the wordplay.
'old lover' becomes 'ex' (an ex-lover).
'in' indicates putting letters inside.
'affair' becomes 'fling' (a fling is a romantic affair).
'ex' inserted inside 'fling' is 'FLEXING'.
Can you help me to learn more?
(Another definition for flexing that I've seen is " getting tense".)