In favour of probing article intended to protect outfit (5)
I believe the answer is:
apron
'intended to protect outfit' is the definition.
I can't tell whether this defines the answer.
'in favour of probing article' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'probing' indicates putting letters inside (probe can mean to poke or prod into).
'article' becomes 'an' (indefinite article).
'pro' inserted into 'an' is 'APRON'.
Can you help me to learn more?
(Other definitions for apron that I've seen before include "Extension of stage in front of curtain" , "Kitchen garment or part of airfield" , "Protective garment worn at front" , "Kitchen protector" , "Space in front of curtain" .)