Gunners crazy about royalty (7)
I believe the answer is:
battery
'gunners crazy' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'royalty' is the wordplay.
I cannot quite understand how this works, but
'royalty' could be 'er' (abbreviation for Elizabeth Regina) and 'er' is located in the answer.
The remaining letters 'batty' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'about' is the link.
Can you help me to learn more?
(Other definitions for battery that I've seen before include "Electricity source" , "Infliction of violence" , "it makes poultry grow faster" , "Electrical 1 down" , "Source of charge" .)