One goes over handy tips to catch train (4,4)
'one goes over handy tips' is the definition.
(a nail file is used on tips of fingers)
'catch train' is the wordplay.
'catch' becomes 'nail' (nail can mean to catch or arrest).
'train' becomes 'file' (file can mean a train or row of people).
'nail'+'file'='NAIL-FILE'
'to' is the link.
(Other definitions for nail file that I've seen before include "Manicure tool" , "Bored receptionist's grooming tool?" , "Roughened metal strip for trimming horny hands" , "Manicure item" , "Something a manicurist might use" .)
'one goes over handy tips' is the definition.
I can't judge whether this defines the answer.
'catch train' is the wordplay.
'catch' becomes 'nail' (nail can mean to catch or arrest).
'train' becomes 'file' (file can mean a train or row of people).
'nail'+'file'='NAILFILE'
'to' is the link.
Can you help me to learn more?
(Other definitions for nailfile that I've seen before include "Manicure item" , "Manicurist's tool" .)