Hard work interrupted by openings for trilling light laugh (7)
I believe the answer is:
chortle
'laugh' is the definition.
(I know that chortle is a type of laugh)
'hard work interrupted by openings for trilling light' is the wordplay.
'hard work' becomes 'chore' (chore is a kind of work. I am not sure about the 'hard' bit.).
'interrupted by' is an insertion indicator.
'openings for' suggests taking the first letters (the letters which open the words).
The initial letters of 'trilling light' is 'tl'.
'chore' enclosing 'tl' is 'CHORTLE'.
Can you help me to learn more?
(Other definitions for chortle that I've seen before include "Guffaw" , "Joyous chuckle" , "Noisy gleeful laugh" , "Chuckle merrily" , "Laugh gleefully" .)