Arrive holding container to join together (7)
I believe the answer is:
combine
'join together' is the definition.
(I've seen this before)
'arrive holding container' is the wordplay.
'arrive' becomes 'come' (synonyms).
'holding' indicates putting letters inside.
'container' becomes 'bin' (bin is a type of container).
'come' going around 'bin' is 'COMBINE'.
'to' acts as a link.
(Other definitions for combine that I've seen before include "marry" , "Put together" , "Mix together different elements" , "Join together" , "Unite; some farm machinery" .)