Mechanical ear's covered by fleece (7)
I believe the answer is:
robotic
'mechanical' is the definition.
(I've seen this before)
'ear's covered by fleece' is the wordplay.
'ear' becomes 'otic' (I've seen this before).
'covered by' says to put letters next to each other (on top of in a down clue).
'fleece' becomes 'rob' ('rob' can be a synonym of 'fleece').
'otic' put after 'rob' is 'ROBOTIC'.
(Other definitions for robotic that I've seen before include "Mechanistic" , "Automaton-like" , "Unthinking, like a machine" , "Mechanically-produced" , "acting without thinking?" .)