Suggested delicacy one has filled (5)
I believe the answer is:
tacit
'suggested' is the definition.
(I've seen this in another clue)
'delicacy one has filled' is the wordplay.
'delicacy' becomes 'tact' (I've seen this in another clue).
'one has' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'filled' means one lot of letters goes inside another.
'tact' placed around 'i' is 'TACIT'.
Can you help me to learn more?
(Other definitions for tacit that I've seen before include "Implied but not directly expressed" , "without speaking" , "Unvoiced" , "Unrecorded" , "Implied without being put into words" .)