Struggling to inspire praise when nursing a broken heart (10)
I believe the answer is:
breathless
'struggling to inspire' is the definition.
(inspire can mean to breathe in)
'praise when nursing a broken heart' is the wordplay.
'praise' becomes 'bless' (I've seen this before).
'when nursing' indicates putting letters inside (inserted letters are guarded or nursed).
'a broken' indicates anagramming the letters.
'heart' with letters rearranged gives 'reath'.
'bless' going around 'reath' is 'BREATHLESS'.
(Other definitions for breathless that I've seen before include "Still" , "Spent" , "panting?" , "Gasping for air" , "Short-winded" .)