Stroke stomach close to navel (5)
I believe the answer is:
crawl
'stroke' is the definition.
(crawl is a kind of stroke)
'stomach close to navel' is the wordplay.
'stomach' becomes 'craw' (craw is a kind of stomach).
'close to' says to take the final letters (the close/ending of).
The last letter of 'navel' is 'l'.
'craw'+'l'='CRAWL'
(Other definitions for crawl that I've seen before include "Go on hands and knees" , "but very slowly on land" , "Proceed on hands and knees" , "inch" , "Be obsequious; swimming stroke" .)