Central (3)
'central' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for prime that I've seen before include "Best - get ready" , "Capital - of first importance" , "Number with no factor but itself and 1" , "put in the picture" , "Main; make ready" .)
'central' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for inner that I've seen before include "This sort of man will be satisfied!" , "Part of an archery target" , "Central area of a city, often old" , "red" , "Opposite of 13" .)
'central' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for focal that I've seen before include "Relating to point of concentration" , "Of the point of convergence" , "Relating to a centre of interest" , "- length characterises a lens" , "Relating to a central point of interest" .)
'central' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for middle that I've seen before include "Equally distant from the extremes" , "(A person's) waist" , "Its equally distant from all directions" , "Centre point" , "Compromise position" .)
'central' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for mid that I've seen before include "Denote the centre point" , "Of the central part" , "Prefix meaning centre" , "Dim sort of prefix" .)