Help Dan handle rocks (4,1,4)
I believe the answer is:
lend a hand
'help' is the definition.
(I've seen this in another clue)
'dan handle rocks' is the wordplay.
'rocks' indicates an anagram.
'dan'+'handle'='danhandle'
'danhandle' is an anagram of 'LEND A HAND'.
(Other definitions for lend a hand that I've seen before include "Pitch in" , "To assist" , "temporarily transfer an employee" , "Turn to and help" , "Give assistance" .)