Fungus infects a cigar (6)

I believe the answer is:

agaric

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

'fungus' is the definition.
(I know that agaric is a type of fungus)

'infects a cigar' is the wordplay.
'a cigar' anagrams to 'AGARIC'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for agaric that I've seen before include "Fungus, eg, mushroom" , "Fungus of mushroom family" , "Type of mushroom" , "fungal growth" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app