One task the fewer for the unemployed (7)
I believe the answer is:
jobless
'the unemployed' is the definition.
(I've seen this in another clue)
'one task the fewer' is the wordplay.
'one task' becomes 'job' (synonyms).
'the fewer' becomes 'less' (I've seen this in another clue).
'job'+'less'='JOBLESS'
'for' is the link.
(Other definitions for jobless that I've seen before include "Out of work" , "Unemployed" , "Without employment" .)