Cause grieving blokes get in their hearts (5)
I believe the answer is:
evoke
'cause grieving blokes' is the definition.
'evoke' can be an answer for 'cause' (evoking is a kind of causing). I'm unsure of the 'grieving blokes' bit.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for evoke that I've seen before include "Call back (memories)" , "Awake memories" , "Bring (a thing) to mind" , "Call forth (a response)" , "Summon up" .)