Tammy's out of turn, but may do a good deed (5)
I believe the answer is:
scout
'do a good deed' is the definition.
'scout' can be an answer for 'do' (thesaurus). I am unsure of the 'a good deed' bit.
'tammy's out of turn but' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is present in the answer.
'turn' could be 'cut' (cutting is a kind of turning) and 'cut' is found in the remaining letters.
A single letter 's' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'may' acts as a link.
Can you help me to learn more?
(Other definitions for scout that I've seen before include "Information-gathering soldier" , "One on a recce mission" , "Soldier on a recce mission" , "Talent seeker - boy on a jamboree" , "Person sent out to gain information" .)