Borrowers strode agitatedly around the head of the bank (7)

'borrowers' is the definition.
(debtor is a kind of borrower)

'strode agitatedly around the head of the bank' is the wordplay.
'agitatedly' is an anagram indicator (I've seen this in other clues).
'around' means one lot of letters goes inside another.
'the head of' indicates taking the first letters.
The initial letter of 'bank' is 'b'.
'strode' is an anagram of 'detors'.
'detors' placed around 'b' is 'DEBTORS'.