Continued to put money into the plant (7)
I believe the answer is:
resumed
'continued' is the definition.
(resuming is a kind of continuing)
'money into the plant' is the wordplay.
I cannot quite see how this works, but
'money' could be 'sum' (I've seen this in other clues) and 'sum' is found in the answer.
'plant' could be 'reed' (reed is a kind of plant) and 'reed' is found within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
'to put' acts as a link.
Can you help me to learn more?
(Other definitions for resumed that I've seen before include "Began again" , "got to work on again" , "came into play again" , "Restarted" , "Recommenced" .)