Crossword Genius

Might gelding be niggled by this? (7)

Ross

I believe the answer is:

anagram

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

'niggled by this?' is the definition.
The definition suggests a singular noun which matches the answer.

'might gelding be' is the wordplay.
I cannot quite see how this works, but
'be' could be 'am' and 'am' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for anagram that I've seen before include "Word arranged from the letters of another" , ""Angered" of "enraged", perhaps?" , "For racing tipster, starting price, for example" , "type of clue" , "Hedonism for Sondheim" .)

I've seen this clue in The Sun.
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