Relative getting taxman releasing money unexpectedly - a source of ease (8)
I believe the answer is:
relaxant
'a source of ease' is the definition.
I can't tell whether this definition defines the answer.
'relative getting taxman releasing money unexpectedly' is the wordplay.
'relative getting' becomes 'rel' (I can't explain this - if you can you should believe this answer much more).
'releasing' indicates named letters should be taken away.
'money' becomes 'm' (abbreviation used in economics).
'unexpectedly' is an anagram indicator.
'taxman' with 'm' taken out is 'taxan'.
'taxan' with letters rearranged gives 'axant'.
'rel'+'axant'='RELAXANT'
Can you help me to learn more?
(Other definitions for relaxant that I've seen before include "calmer" , "Drug reducing rigidity" , "calming influence" , "tension reliever" , "Tension-reducing drug" .)