It was less than fortunate in being caught (4)

I believe the answer is:

tuna

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'it was less than' is the definition.
The definition suggests a singular noun which matches the answer.

'fortunate in being caught' is the wordplay.
'being caught' indicates a hidden word (I've seen 'catches' mean this (the answer is caught in the clue)).
'TUNA' can be found hidden inside 'fortunate in'.

Can you help me to learn more?

(Other definitions for tuna that I've seen before include "Large edible sea fish, often canned" , "Popular food fish" , "Tunny" , "A fish; sounds like piano juster" , "swimmer" .)

I've seen this clue in the Evening Standard.

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