Capacious container (or ancient outbuilding?) (7)
I believe the answer is:
holdall
'capacious container' is the definition.
'holdall' can be an answer for 'container' (holdall is a kind of container). I'm unsure of the 'capacious' bit.
'ancient outbuilding?' is the wordplay.
I cannot really understand how this works, but
'ancient' could be 'old' (similar in meaning) and 'old' is present in the answer.
The remaining letters 'hall' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'or' is the link.
Can you help me to learn more?
(Other definitions for holdall that I've seen before include "retainer" , "Large bag (no need for another?)" , "Large case, with handles" , "Large carrying bag" , "Large strong bag with handles or shoulder strap" .)