Desperately plea for air conditioning in building (6)
I believe the answer is:
palace
'building' is the definition.
(I have seen 'Large building' mean 'palace' so perhaps 'building' could also mean 'palace')
'desperately plea for air conditioning' is the wordplay.
I cannot quite understand how this works, but
'air conditioning' could be 'ac' and 'ac' is found within the answer.
an anagram of 'plea' is 'pale' which is within the remaining letters.
No letters remain.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for palace that I've seen before include "Royal mansion" , "large house" , "Royal building" , "Sovereign's residence" , "Regal mansion" .)