Beefcake oddly found in stream (4)
I believe the answer is:
beck
'stream' is the definition.
(northern English dialect term for 'stream')
'beefcake oddly' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternate letters of 'beefcake' are 'BECK'.
'found in' acts as a link.
(Other definitions for beck that I've seen before include "Call for attention" , "burn" , "The Yardbirds' guitarist, Jeff" , "Stream (N. England)" , "Wave" .)