I tried swimming with Penny in disturbed sea (4,3)
I believe the answer is:
tide rip
'disturbed sea' is the definition.
(I've seen this before)
'i tried swimming with penny' is the wordplay.
'swimming with' indicates anagramming the letters.
'penny' becomes 'p'.
'i'+'tried'='itried'
'itried' anagrammed with 'p' gives 'TIDE-RIP'.
'in' is the link.
(Other definitions for tide rip that I've seen before include "rough water" , "disturbed sea" , "Disturbance likely in 11 [EURIPUS]" .)