Crossword Genius

Fail to back up lease, depressed (3,4)

Ross

I believe the answer is:

let down

'fail to back up' is the definition.
(as in failing to back up a promise)

'lease depressed' is the wordplay.
'lease' becomes 'let' (synonyms).
'depressed' becomes 'down' (synonyms).
'let'+'down'='LET-DOWN'

(Other definitions for let down that I've seen before include "Aircraft descent" , "Fail to meet expectations of others" , "Disappoint, fail to keep promise" , "Failed - to deflate a tyre - disappointed" , "Failed - deflated" .)

I've seen this clue in The Telegraph.
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