Are in the right, first and last, but it’s more limited (5)
I believe the answer is:
rarer
'more limited' is the definition.
Both the answer and definition are comparative adjectives. Perhaps there's a link between them I don't understand?
'are in the right first and last but' is the wordplay.
'in the' is an insertion indicator.
'right first' becomes 'r' (rst letter of 'right').
'and' is a charade indicator (letters next to each other).
'last but' becomes 'r' (I can't explain this - if you can you should give a lot more credence to this answer).
'r'+'r'='rr'
'are' inserted within 'rr' is 'RARER'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for rarer that I've seen before include "Thinner" , "Less often seen" , "steak may be wanted thus?" , "More unusual" , "More scarce or uncommon" .)