Mock lacquering done with a lot of hot air (14)
I believe the answer is:
grandiloquence
'a lot of hot air' is the definition.
'mock lacquering done' is the wordplay.
'mock' indicates an anagram.
'lacquering'+'done'='lacqueringdone'
'lacqueringdone' is an anagram of 'GRANDILOQUENCE'.
'with' acts as a link.
(Other definitions for grandiloquence that I've seen before include "Boastful speech" , "Pompous speech" , "Pompous style" .)