Adapted to ideal requirements, primarily? (8)
I believe the answer is:
tailored
'adapted to ideal requirements primarily?' is the definition.
I can't tell whether this definition defines the answer.
'adapted to ideal requirements primarily?' is the wordplay.
'adapted' indicates anagramming the letters.
'primarily?' suggests taking the first letters (I've seen 'primarily' mean this).
The first letter of 'requirements' is 'r'.
'to'+'ideal'+'r'='toidealr'
'toidealr' anagrammed gives 'TAILORED'.
(Other definitions for tailored that I've seen before include "Adjusted" , "Adapted" , "Cut to fit" , "Made garments, suits perhaps" , "cut to size" .)