Dismay with end of aged relative (5)
I believe the answer is:
daunt
'dismay' is the definition.
(both can mean to intimidate)
'with end of aged relative' is the wordplay.
'with' means one lot of letters go next to another.
'end of' indicates one should take the final letters.
'relative' becomes 'aunt' (aunt is a kind of relative).
The final letter of 'aged' is 'd'.
'd' next to 'aunt' is 'DAUNT'.
(Other definitions for daunt that I've seen before include "Frighten, intimidate" , "Cause to feel intimidated" , "Cow" , "Discourage" , "Dishearten" .)