Maybe for each promotion, enterprise will follow (12)
I believe the answer is:
peradventure
'maybe' is the definition.
('peradventure' can be a synonym of 'maybe')
'each promotion enterprise will follow' is the wordplay.
'each' becomes 'per'.
'promotion' becomes 'ad' (ad is a kind of promotion).
'enterprise' becomes 'venture' (I've seen this before**).
'will follow' is a charade indicator (letters next to each other).
'per'+'ad'+'venture'='PERADVENTURE'
'for' acts as a link.
(Other definitions for peradventure that I've seen before include "Maybe" , "Possibly (archaic)" , "perhaps" , "by chance" .)