Cried when I left having taken it on trust (6)
I believe the answer is:
credit
'trust' is the definition.
(I know that credit is a type of trust)
'cried when i left having taken it' is the wordplay.
I cannot quite see how this works, but
an anagram of 'cried' is 'credi' which is within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'on' is the link.
Can you help me to learn more?
(Other definitions for credit that I've seen before include "Opposite of debit" , "Adam and Eve" , "Time allowed to pay" , "Acknowledgement given for deed or quality" , "Believe the time to pay?" .)