Clubs justify storing case of labels for identification of station (4,4)
I believe the answer is:
call sign
'identification of station' is the definition.
(a call sign identifies a radio station)
'clubs justify storing case of labels' is the wordplay.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'justify' becomes 'align' (as in to justify text on a page).
'storing' is an insertion indicator.
'case of' says to hollow out the word (remove centre letters) (outsides of).
'labels' with its middle removed is 'ls'.
'align' going around 'ls' is 'allsign'.
'c'+'allsign'='CALL SIGN'
'for' acts as a link.
(Other definitions for call sign that I've seen before include "Radio station or aircraft identifier" , "Unique designation in radio communications" , "Air Force One, say" , "Radio ID" , "Radio identification" .)