Fertiliser from Nicaragua no longer used (5)

I believe the answer is:

guano

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

'fertiliser' is the definition.
(I've seen this before)

'nicaragua no longer used' is the wordplay.
'GUANO' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

'from' is the link.

Can you help me to learn more?

(Other definitions for guano that I've seen before include "dried excrement" , "Fertiliser from seabirds" , "type of fertiliser" , "Fertilizer from the waste of seabirds" , "Dung of sea birds" .)

I've seen this clue in The Irish Independent.

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