Its just routine to find fish inside (5)

I believe the answer is:

trout

I'm a little stuck... Click here to teach me more about this clue!

'fish inside' is the definition.
'trout' can be an answer for 'fish' (I've seen this before). I am not sure about the 'inside' bit.

'its just routine to find' is the wordplay.
'to find' indicates a hidden word (I've seen 'found' mean this).
'TROUT' is hidden within 'its just routine'.

Can you help me to learn more?

(Other definitions for trout that I've seen before include "Freshwater game fish" , "Tasty fish, perhaps of rainbow kind" , "Catch" , "Food fish" , "Fish - old harridan" .)

I've seen this clue in The Irish News.

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