Just gathering Philistine's clothing in public view (6)
I believe the answer is:
openly
'in public view' is the definition.
(thesaurus)
'just gathering philistine's clothing' is the wordplay.
'just' becomes 'only' (synonyms).
'gathering' indicates putting letters inside (gather can mean to acquire or bring in).
'clothing' suggests removing the centre.
'philistine' with its centre removed is 'pe'.
'only' placed around 'pe' is 'OPENLY'.
(Other definitions for openly that I've seen before include "In frank and candid manner" , "Frankly, honestly" , "In an overt way" , "Without concealment or prevarication" , "Above board" .)