Wartime pilot must circumvent something hairy, cause of obstruction (9)

I believe the answer is:

blockader

'cause of obstruction' is the definition.

'wartime pilot must circumvent something hairy' is the wordplay.
'wartime pilot' becomes 'bader' (WW2 pilot Douglas Bader).
'must circumvent' indicates putting letters inside (to circumvent is to get around).
'something hairy' becomes 'lock' (a lock of hair).
'bader' going around 'lock' is 'BLOCKADER'.

I've seen this clue in The Guardian.

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