Discovered more bread mainly bolsters husband's testosterone? (7)
I believe the answer is:
hormone
'testosterone?' is the definition.
(testosterone is a kind of hormone)
'discovered more bread mainly' is the wordplay.
'discovered more' becomes 'hor' (I am not sure about this - if you are sure you should believe this answer much more).
'bread' becomes 'money' (slang term for money).
'mainly' means to remove the last letter (virtually or mainly the word, but not all of it).
'money' with its final letter taken off is 'mone'.
'hor'+'mone'='HORMONE'
'bolsters husband's' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for hormone that I've seen before include "Compound" , "Bodily activity regulator" , "therapy to replace this?" , "Substance that stimulates cells in moorhen" , "chemical constituent" .)