Officer orders lane to be diverted round square (8,6)
I believe the answer is:
squadron leader
'officer' is the definition.
(I've seen this before)
'orders lane to be diverted round square' is the wordplay.
I cannot really understand how this works, but
an anagram of 'lane' is 'nlea' which is located in the answer.
'round' could be 'o' (round can mean a round object) and 'o' is found within the answer.
'square' could be 'quad' (I've seen this before) and 'quad' is present in the answer.
This explanation may well be incorrect...
(Another definition for squadron leader that I've seen is " officer".)