Sad about husband having to sprint (4)
I believe the answer is:
dash
'to sprint' is the definition.
(synonyms)
'sad about husband' is the wordplay.
'about' is a reversal indicator.
'husband' becomes 'h' (abbreviation).
'sad' back-to-front is 'das'.
'das'+'h'='DASH'
'having' acts as a link.
(Other definitions for dash that I've seen before include "- - ; panache" , "Run; lan" , "instrument panel" , "rats" , "Hasten; hyphen" .)