Muscular sailor Dad and I reported (6)
I believe the answer is:
popeye
'muscular sailor' is the definition.
'dad and i reported' is the wordplay.
'dad' becomes 'pop' ('pop' can be a synonym of 'dad').
'and' means one lot of letters go next to another.
'reported' indicates a 'sounds like' (homophone) clue.
'i' is a homophone of 'eye'.
'pop'+'eye'='POPEYE'
(Other definitions for popeye that I've seen before include "Bluto's rival" , "comic sailor" , "The Sailor Man" , "Spinach and Olive Oyl lover" , "Cartoon sailor (showing amazement?)" .)