Possibly save about £1 for a bag (6)
I believe the answer is:
valise
'a bag' is the definition.
(valise is a kind of bag)
'possibly save about aps1' is the wordplay.
'possibly' indicates anagramming the letters.
'about' indicates putting letters inside.
'apsl' becomes 'li' (I can't justify this - if you can you should believe this answer much more).
'save' is an anagram of 'vase'.
'vase' placed around 'li' is 'VALISE'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for valise that I've seen before include "Elvis A? (anag)" , "Overnight case" , "Small overnight bag" , "Small piece of luggage" , "Travel bag" .)