She's spotted following a band (4)
I believe the answer is:
anna
'she's' is the definition.
(I've seen this before)
'spotted following a band' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
The remaining letters 'na' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for anna that I've seen before include "and eleven, twenty four across heroine" , "Unit of length" , "Book by Tolstoy" , "Miss Karenina" , "worth very little in India" .)