Large chip maker's building support (6)
I believe the answer is:
lintel
'support' is the definition.
(lintel is a kind of support)
'large chip maker's' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'chip maker' becomes 'intel' (I've seen this in another clue).
'l'+'intel'='LINTEL'
'building' acts as a link.
(Other definitions for lintel that I've seen before include "Supportive member" , "Support over a door or window" , "Top of door or window frame" , "support is needed" , "It's found above the door" .)