Two girls returning, with friend about, describing many of the sights of Egypt (9)
I believe the answer is:
pyramidal
'describing many of the sights of egypt' is the definition.
(Egypt contains many pyramids)
'two girls returning with friend about' is the wordplay.
I cannot really understand how this works, but
'friend' could be 'ami' (I've seen this before) and 'ami' is found in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
This explanation may well be incorrect...
(Another definition for pyramidal that I've seen is " The kind of orchid".)