Pledge to get golf mound on board (9)
I believe the answer is:
committee
'board' is the definition.
(I've seen this before)
'pledge to get golf mound on' is the wordplay.
'pledge' becomes 'commit' (I've seen this in another clue).
'to' says to put letters next to each other.
'get' says to put letters next to each other.
'golf mound' becomes 'tee' (I've seen this in another clue).
'on' says to put letters next to each other.
'commit'+'tee'='COMMITTEE'
(Other definitions for committee that I've seen before include "Parliamentary group" , "Convened group" , "politburo, perhaps" , "Panel set up for a purpose" , "Group of people selected to run things" .)