Taking care of tour's start and finish (7)
I believe the answer is:
tending
'taking care of' is the definition.
(tending is a kind of taking care of)
'tour's start and finish' is the wordplay.
'tour's start' becomes 't' (I am not sure about this - if you are sure you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'finish' becomes 'ending' (I've seen this before).
't'+'ending'='TENDING'
Can you help me to learn more?
(Other definitions for tending that I've seen before include "Taking care of or leaning towards" , "Naturally disposed toward" , "Waiting on" .)