Cupboard that will give more air (7)
I believe the answer is:
armoire
'cupboard that' is the definition.
'armoire' can be an answer for 'cupboard' (I've seen this before). I'm unsure of the remainder of the definition.
'give more air' is the wordplay.
'give' indicates an anagram (I've seen 'giving' mean this (the letters give the letters for another word)).
'more'+'air'='moreair'
'moreair' is an anagram of 'ARMOIRE'.
'will' acts as a link.
Can you help me to learn more?
(Other definitions for armoire that I've seen before include "Large wardrobe or cabinet" , "Cupboard" , "Cabinet originally used for storing weapons" , "Large wardrobe - more air (anag)" , "item of furniture" .)