Farewell to the capital servant (5)
I believe the answer is:
valet
'servant' is the definition.
(valet is a kind of servant)
'farewell to the capital' is the wordplay.
'farewell' becomes 'vale' (I've seen this before).
'the capital' indicates taking the first letters.
The first letter of 'to' is 't'.
'vale'+'t'='VALET'
(Other definitions for valet that I've seen before include "Personal male assistant" , "Gentleman%u2019s gentleman" , "Gentleman's gentleman" , "Man's manservant" , "Batman" .)