Incarceration that will make a bigger man of? (7)
I believe the answer is:
stretch
'make a bigger man of?' is the definition.
'stretch' can be an answer for 'make' (thesaurus). I am unsure of the 'a bigger man of?' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for stretch that I've seen before include "sort of limousine" , "Bit of exercise" , "Make to go further" , "Extend; period in prison" , "Tax" .)