Gets thanks when filling ordinary containers (7)
I believe the answer is:
obtains
'gets' is the definition.
(obtaining is a kind of getting)
'thanks when filling ordinary containers' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'when filling' is an insertion indicator.
'ordinary' becomes 'o' (abbreviation e.g. O-Levels).
'containers' becomes 'bins' (bin is a kind of container).
'o'+'bins'='obins'
'ta' put inside 'obins' is 'OBTAINS'.
(Other definitions for obtains that I've seen before include "Authority" , "Gets" .)