Crossword Genius

Nothing held back by droll uncle (4)

Ross

I believe the answer is:

null

'nothing' is the definition.
(I know that nothing can be written as null)

'held back by droll uncle' is the wordplay.
'back by' is a reversal indicator.
'held' indicates a hidden word.
'llun' can be found hidden inside 'droll uncle'.
'llun' back-to-front is 'NULL'.

(Other definitions for null that I've seen before include "Invalid; empty" , "Without value or consequence" , "Useless - nothing" , "Legally void" , "Of no effect, value" .)

I've seen this clue in The Irish Times.
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