Invest in issue and repent right away (5)
I believe the answer is:
endue
'invest' is the definition.
(synonyms)
'issue and repent right away' is the wordplay.
'issue' becomes 'end' (I can't explain this - if you can you should believe this answer much more).
'and' says to put letters next to each other.
'repent' becomes 'rue' (synonyms).
'right' becomes 'R' (common abbreviation).
'away' suggests deleting specific letters.
'rue' with 'r' removed is 'ue'.
'end'+'ue'='ENDUE'
'in' is the link.
Can you help me to learn more?
(Other definitions for endue that I've seen before include "Supply or provide" , "Invest - provide" , "Put on clothes" , "Endow (poetic)" , "Provide or imbue" .)