Doing a solicitor's work in a royal capacity (6)
I believe the answer is:
asking
'doing a solicitor's work' is the definition.
(solicit can mean ask)
'in a royal capacity' is the wordplay.
'in' is an insertion indicator.
'royal' becomes 'king' (I've seen this before).
'capacity' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'king'='aking'
'aking' going around 's' is 'ASKING'.
(Other definitions for asking that I've seen before include "For the ___; freely available" , "Appealing" , "Inviting (to an event)" , "Making request" , "Begging" .)