Uncritical admirer of leotard I designed (8)
I believe the answer is:
idolater
'uncritical admirer' is the definition.
'idolater' can be an answer for 'admirer' (I've seen this before). I'm not sure about the 'uncritical' bit.
'leotard i designed' is the wordplay.
'designed' is an anagram indicator (designed with the letters).
'leotard'+'i'='leotardi'
'leotardi' with letters rearranged gives 'IDOLATER'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for idolater that I've seen before include "False worshipper; tailored (anag.)" , "No orthodox believer" , "Tailored to worshipper of graven images" , "Worshipper of false gods" , "Besotted admirer" .)