Pale colour of phone casing this person brought round (5)
I believe the answer is:
lilac
'pale colour' is the definition.
'phone casing this person brought round' is the wordplay.
'phone' becomes 'call' (synonyms).
'casing' means one lot of letters goes inside another (I've seen this in other clues).
'this person' becomes 'I' (the person writing).
'brought round' shows that the letters should be reversed in order.
'call' enclosing 'i' is 'calil'.
'calil' back-to-front is 'LILAC'.
'of' is the link.
(Other definitions for lilac that I've seen before include "Purplish in colour" , "Fragrant, pale purple flower" , "Shade" , "Light-purple" , "Fragrant shrub; colour" .)