Love admitted by champ and companion for genetic engineering, say? (7)
I believe the answer is:
biotech
'genetic engineering say?' is the definition.
(genetic engineering is a type of biotechnology)
'love admitted by champ and companion' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'admitted by' means one lot of letters goes inside another.
'champ' becomes 'bite' (I've seen this before).
'and' is a charade indicator (letters next to each other).
'companion' becomes 'ch' (Companion of Honour).
'o' put into 'bite' is 'biote'.
'biote'+'ch'='BIOTECH'
'for' is the link.
(Another definition for biotech that I've seen is " Molecular science applied to industrial processes".)