Popular fellow -- before feeble anger (7)
I believe the answer is:
inflame
'anger' is the definition.
(I've seen this before)
'popular fellow before feeble' is the wordplay.
'popular' becomes 'in'.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'before' means one lot of letters go next to another.
'feeble' becomes 'lame' ('lame' can be a synonym of 'feeble').
'in'+'f'+'lame'='INFLAME'
(Other definitions for inflame that I've seen before include "Make (a situation) worse" , "fan" , "Incite" , "Exacerbate" , "Provoke to anger" .)