Crossword Genius

Furious when barrier's lifted (3)

Ross

I believe the answer is:

mad

'furious' is the definition.
(I've seen this in another clue)

'barrier's lifted' is the wordplay.
'barrier' becomes 'dam' (dam is a kind of barrier).
'lifted' says the letters should be written in reverse (going up in down clue).
'dam' reversed gives 'MAD'.

'when' acts as a link.

(Other definitions for mad that I've seen before include "abandoned" , "Deranged" , "(Of a dog) rabid" , "Angry or insane" , "Crazy" .)

I've seen this clue in the Evening Standard.
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