Shocked seeing husband in range shot heartlessly (6)
I believe the answer is:
aghast
'shocked' is the definition.
('aghast' can be a synonym of 'shocked')
'husband in range shot heartlessly' is the wordplay.
'husband' becomes 'h'.
'in' indicates putting letters inside.
'range' becomes 'aga' (I've seen this before**).
'heartlessly' says to hollow out the word (remove centre letters).
'shot' with its centre taken out is 'st'.
'h' inserted into 'aga' is 'agha'.
'agha'+'st'='AGHAST'
'seeing' is the link.
(Other definitions for aghast that I've seen before include "Appalled, shocked" , "Horror-struck" , "Struck with horror" , "Horror-stricken, filled with consternation" , "Horrified, appalled" .)