Is this chap the one a lass is crazy about? (5)
I believe the answer is:
silas
'is this chap' is the definition.
'Silas' can be an answer for 'chap'. I am not certain of the rest of the definition.
'one a lass is crazy about?' is the wordplay.
'one' becomes 'i' (Roman numeral).
'is crazy' indicates anagramming the letters.
'about?' indicates putting letters inside.
'lass' with letters rearranged gives 'slas'.
'i' going into 'slas' is 'SILAS'.
'the' is the link.
Can you help me to learn more?
(Other definitions for silas that I've seen before include "Weaver" , "-- Marner (George Eliot novel)" , "Armies snarl (anag), novel by 14 21" , "Chap" , "Forename of miser" .)