First, put up plait in individual clasps (7)
I believe the answer is:
initial
'first' is the definition.
(similar in meaning)
'in individual clasps' is the wordplay.
'individual' becomes 'i' (Roman numeral for one, ie individual).
'clasps' becomes 'tial' (I can't explain this - if you can you should believe this answer much more).
'in'+'i'+'tial'='INITIAL'
'put up plait' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for initial that I've seen before include "Occurring at the beginnng" , "Approve" , "First - opening" , "First letter of a name" , "First letter (of a word)" .)