Crossword Genius

Spies area in underground lavatory (6,6)

Ross

I believe the answer is:

secret agents

'spies' is the definition.
(I've seen this before)

'area in underground lavatory' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'in' means one lot of letters goes inside another.
'underground' becomes 'secret' ('secret' can be a synonym of 'underground'**).
'lavatory' becomes 'gents'.
'secret'+'gents'='secretgents'
'a' placed within 'secretgents' is 'SECRET AGENTS'.

(Another definition for secret agents that I've seen is " Spies".)

I've seen this clue in The Telegraph.
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