Bound to put small donation in hat (7)
I believe the answer is:
limited
'bound' is the definition.
(I've seen this before)
'small donation in hat' is the wordplay.
'small donation' becomes 'mite' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'hat' becomes 'lid' (lid can informally mean a hat).
'mite' placed into 'lid' is 'LIMITED'.
'to put' acts as a link.
Can you help me to learn more?
(Other definitions for limited that I've seen before include "Sort of company" , "Bound" , "plc" , "Restricted in extent/size" , "was restricting" .)