Crossword Genius

A glue has spilled on the top end, which is a nuisance (6)

Ross

I believe the answer is:

plague

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

'a nuisance' is the definition.
(thesaurus)

'a glue has spilled on the top end' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
an anagram of 'glue' is 'lgue' which is located in the remaining letters.
A single letter 'p' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'which is' acts as a link.

Can you help me to learn more?

(Other definitions for plague that I've seen before include "Swarm of insects" , "Outbreak of a deadly disease, or infestation of pest like locusts" , "Widespread, contagious and destructive disease" , "Large-scale illness" , "Badger" .)

I've seen this clue in the Evening Standard.
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