Am I in frail condition? Quite well known! (8)
I believe the answer is:
familiar
'quite well known' is the definition.
'familiar' can be an answer for 'known' (similar in meaning). I'm not certain of the 'quite well' bit.
'am i in frail condition?' is the wordplay.
'in' means one lot of letters goes inside another.
'condition?' is an anagram indicator (I've seen 'conditions' mean this (letters must be in a new condition)).
'am'+'i'='ami'
'frail' is an anagram of 'fliar'.
'ami' going inside 'fliar' is 'FAMILIAR'.
Can you help me to learn more?
(Other definitions for familiar that I've seen before include "Witch's companion" , "Well known or easily recognised" , "Everyday; recognisable" , "Conservant with the witch's cat?" , "Well-known like witch's assistant" .)