Crossword Genius

Tot eaten by fish? It's a nightmare! (3,5)

Ross

I believe the answer is:

bad dream

'a nightmare' is the definition.
(thesaurus)

'tot eaten by fish?' is the wordplay.
'tot' becomes 'add' ('add' can be a synonym of 'tot').
'eaten by' is an insertion indicator.
'fish?' becomes 'bream' (bream is a kind of fish**).
'add' inserted inside 'bream' is 'BAD DREAM'.

'it's' acts as a link.

(Another definition for bad dream that I've seen is " hallucination".)

I've seen this clue in The Telegraph.
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