Press gallery's close to mocking literary style (5)
I believe the answer is:
irony
'literary style' is the definition.
(I've seen this in another clue)
'press gallery's close to' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'close to' suggests the final letters (the close/ending of).
The final letter of 'gallery' is 'y'.
'iron'+'y'='IRONY'
'mocking' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for irony that I've seen before include "Sarcastic use of praise" , "Subtle humour" , "the reverse of what you'd expect" , "(Words) inferring the opposite of what's actually said" , "Satirical speech form" .)