Hurry over and see heartless carer (5)
I believe the answer is:
nurse
'carer' is the definition.
(I've seen this before)
'hurry over and see heartless' is the wordplay.
'hurry' becomes 'run' (running is a kind of hurrying).
'over' says the letters should be written in reverse.
'and' is a charade indicator (letters next to each other).
'heartless' suggests removing the centre.
'see' with its centre taken out is 'se'.
'run' back-to-front is 'nur'.
'nur'+'se'='NURSE'
(Other definitions for nurse that I've seen before include "dogfish or > worker bee" , "Sister, e.g." , "One caring for patient" , "Tend to patient" , "One ministering to the sick" .)