Strained fling's great pleasure cut short (5)
I believe the answer is:
heave
'strained fling's' is the definition.
'heave' can be an answer for 'fling's' (I've seen this in another clue). I'm not sure about the 'strained' bit.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for heave that I've seen before include "Throw with force - retch" , "Produce (a sigh); lift" , "Tug-of-war cry" , "Haul - retch" , "Throw; haul by rope (naut.)" .)