Cover and centre of magazine in yellow colour (5)
I believe the answer is:
topaz
'yellow colour' is the definition.
(topaz is a shade of yellow)
'cover and centre of magazine' is the wordplay.
'cover' becomes 'top' (synonyms).
'and' is a charade indicator (letters next to each other).
'centre of' indicates the central letters.
The middle of 'magazine' is 'az'.
'top'+'az'='TOPAZ'
'in' is the link.
(Other definitions for topaz that I've seen before include "Yellow or pale blue gem" , "Yellow quartz used for gemstones" , "Yellowish-brown gemstone" , "White/colourless mineral used as a gemstone" , "White or colourless gemstone" .)