Baseball infielder’s two items of clothing (9)
I believe the answer is:
shortstop
'baseball infielder's' is the definition.
'shortstop' can be an answer for 'infielder's' (shortstop is a kind of infielder). I'm not certain of the 'baseball' bit.
'two items of clothing' is the wordplay.
'two items of' becomes 'shorts' (I can't justify this - if you can you should give a lot more credence to this answer).
'clothing' becomes 'top' (top is a kind of clothing).
'shorts'+'top'='SHORTSTOP'
Can you help me to learn more?
(Other definitions for shortstop that I've seen before include "position in American sport" , "Fielding position (baseball)" , "Opening move" , "US player" , "One in field" .)