Needing money, they strode agitatedly around Birkenhead (7)

I believe the answer is:

debtors

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

'needing money they' is the definition.
The definition suggests an adverb but the answer is not.

'strode agitatedly around birkenhead' is the wordplay.
'agitatedly' is an anagram indicator (I've seen this in other clues).
'around' means one lot of letters goes inside another.
'birkenhead' becomes 'b' (head letter of 'birken').
'strode' anagrammed gives 'detors'.
'detors' placed around 'b' is 'DEBTORS'.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.