Ordinary guy putting that woman in something unacceptable (7)
I believe the answer is:
nonhero
'ordinary guy putting' is the definition.
The definition suggests a singular noun which matches the answer.
'woman in something unacceptable' is the wordplay.
'woman' becomes 'her' (her refers to a woman).
'in' means one lot of letters goes inside another.
'something unacceptable' becomes 'no-no' (I've seen this before).
'her' inserted within 'nono' is 'NONHERO'.
'that' is the link.
Can you help me to learn more?
(Other definitions for nonhero that I've seen before include "One without courage" , "One who is not brave" , "Negative character in a novel" , "Someone far from courageous" , "yellow type" .)