Economic collapse caused by head of Coutts getting reckless (5)
I believe the answer is:
crash
'economic collapse' is the definition.
(I've seen this before)
'head of coutts getting reckless' is the wordplay.
'head of' suggests taking the first letters.
'getting' says to put letters next to each other.
'reckless' becomes 'rash' ('rash' can be a synonym of 'reckless').
The initial letter of 'coutts' is 'c'.
'c'+'rash'='CRASH'
'caused by' is the link.
(Other definitions for crash that I've seen before include "Collide violently" , "Dramatic fall" , "Bang" , "Car accident" , "failure" .)