Bulge in pants Mrs Grundy hides? (8)
I believe the answer is:
'bulge' is the definition.
(I know that bulge can be written as protrude)
'pants mrs grundy hides?' is the wordplay.
I cannot quite understand how this works, but
'pants' could be 'rot' (both can mean rubbish or nonsense) and 'rot' is located in the answer.
'mrs' could be 'pru' and 'pru' is found in the leftover letters.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for protrude that I've seen before include "Get through" , "Jut out" , "Stand out" , "Come out" , "Point out" .)