Earwig gleaming having shed skin (6,2)
I believe the answer is:
listen in
'earwig gleaming having shed skin' is the definition.
I can't tell whether this defines the answer.
'earwig gleaming having shed skin' is the wordplay.
'earwig' becomes 'listen' (earwig can mean to listen to something).
'gleaming' becomes 'luminous' (I've seen this before).
'having shed skin' means to look at the middle letters (outer letters are shed or removed).
The middle letters of 'luminous' are 'in'.
'listen'+'in'='LISTEN IN'
(Other definitions for listen in that I've seen before include "Wire-tapper will" , "Overhear conversation as on phone (6, 2)" , "Eavesdrop" .)