Inexperienced goalie is tender of course (11)
I believe the answer is:
greenkeeper
'tender of course' is the definition.
(a greenkeeper tends a golf course)
'inexperienced goalie' is the wordplay.
'inexperienced' becomes 'green' (similar in meaning).
'goalie' becomes 'keeper' (I've seen this in another clue).
'green'+'keeper'='GREENKEEPER'
'is' is the link.
(Other definitions for greenkeeper that I've seen before include "Person having care of golf course" , "Golf course maintainer" , "Person caring for a golf course" , "One looking after a golf course" , "One maintaining a golf course" .)