Fittingly equipped in the agreed fashion (6)
I believe the answer is:
geared
'fittingly equipped' is the definition.
'geared' can be an answer for 'equipped' (I've seen this in another clue). I'm not sure about the 'fittingly' bit.
'agreed fashion' is the wordplay.
'fashion' indicates an anagram.
'agreed' is an anagram of 'GEARED'.
'in the' is the link.
Can you help me to learn more?
(Other definitions for geared that I've seen before include "Adjusted or adapted to, as car to speed changes" , "Agreed to be adapted" , "Designed" , "Fitted with intermeshing wheels" , "Adjusted or made ready as for action - as for car acceleration?" .)