You say the guys are after power and insight (6)
I believe the answer is:
acumen
'insight' is the definition.
(I've seen this in another clue)
'you say the guys are after power' is the wordplay.
'say' indicates a 'sounds like' (homophone) clue.
'the guys' becomes 'men' (guy can mean a man).
'are after' is a charade indicator (letters next to each other).
'power' becomes 'ac' (AC is an example).
'you' sounds like 'u'.
'u'+'men'='umen'
'umen' after 'ac' is 'ACUMEN'.
'and' is the link.
(Other definitions for acumen that I've seen before include "Gumption" , "Awareness" , "ingenuity" , "The ability to make good and quick decisions" , "Forming judgement" .)