Focus weak around corporation (9)
I believe the answer is:
spotlight
'focus' is the definition.
(I've seen this before)
'weak around corporation' is the wordplay.
'weak' becomes 'slight' (similar in meaning).
'around' is an insertion indicator.
'corporation' becomes 'pot' (corporation can humorously mean a pot belly).
'slight' enclosing 'pot' is 'SPOTLIGHT'.
(Other definitions for spotlight that I've seen before include "Stage actor may be in it" , "Illuminate" , "It illuminates a small area" , "Prominent position" , "put in the public eye" .)