A couple of blokes introducing a form of forage (7)
I believe the answer is:
alfalfa
'form of forage' is the definition.
(type of plant fodder or forage)
'a couple of blokes introducing a' is the wordplay.
'a couple of blokes' means two replacements for 'bloke'.
'bloke' becomes 'Alf' (short for Alfred).
'bloke' becomes 'Alf' (short for Alfred).
'introducing' says to put letters next to each other.
'alf'+'alf'+'a'='ALFALFA'
(Other definitions for alfalfa that I've seen before include "Plant used as fodder" , "food plant" , "odder plant" , "A forage plant" , "cattle feed" .)