Daniel may be fixed ... (6)
I believe the answer is:
nailed
'fixed' is the definition.
(I've seen this before)
'daniel may be' is the wordplay.
'may be' indicates anagramming the letters.
'daniel' is an anagram of 'NAILED'.
(Other definitions for nailed that I've seen before include "Tacked" , "Properly fixed" , "Fastened by Daniel" , "Fastened securely with a pointed piece of metal" , "Firmly fixed" .)