Part of jacket displayed by mimic visiting Lakes (5)
I believe the answer is:
lapel
'part of jacket' is the definition.
(I've seen this before)
'mimic visiting lakes' is the wordplay.
'mimic' becomes 'ape' (ape can mean to copy or imitate).
'visiting' indicates putting letters inside.
'lakes' becomes 'LL' (a geographical abbreviation for lake written twice).
'ape' inserted into 'll' is 'LAPEL'.
'displayed by' acts as a link.
(Other definitions for lapel that I've seen before include "Part of a folded back collar" , "Jacket fold" , "Folded-back part of coat" , "Continuation of a coat collar" , "Folded flap at front of jacket or coat" .)