Intimate guests ordered to go round back of building (7)
I believe the answer is:
suggest
'intimate' is the definition.
(I've seen this before)
'guests ordered to go round back of building' is the wordplay.
'ordered' indicates anagramming the letters.
'to go round' is an insertion indicator.
'back of' indicates one should take the final letters.
The final letter of 'building' is 'g'.
'guests' anagrammed gives 'sugest'.
'sugest' placed around 'g' is 'SUGGEST'.
(Other definitions for suggest that I've seen before include "Put forward (an idea)" , "Insinuate" , "Offer for consideration" , "Put forward for consideration" , "Intimate" .)