Reach for a tin soldier inside it (6)
I believe the answer is:
attain
'reach' is the definition.
(synonyms)
'tin soldier inside it' is the wordplay.
'tin soldier' becomes 'atta' (I am not sure about this - if you are sure you should believe this answer much more).
'inside' says to take the centre.
'it' becomes 'sexiness' (I've seen this before).
The central letters of 'sexiness' are 'in'.
'atta'+'in'='ATTAIN'
'for a' acts as a link.
Can you help me to learn more?
(Other definitions for attain that I've seen before include "Reach, get there as with ambition" , "Succeed in doing, get there" , "Arrive at, accomplish" , "Reach or gain" , "Reach (a particular age)" .)