Mobile phone and chemical company once — one in Dido's homeland (9)
I believe the answer is:
phoenicia
'dido's homeland' is the definition.
(home of Dido in classical mythology)
'mobile phone and chemical company once one' is the wordplay.
'mobile' indicates anagramming the letters.
'and' says to put letters next to each other.
'chemical company once' becomes 'ici' (Imperial Chemical Industries).
'one' becomes 'a'.
'phone' is an anagram of 'phoen'.
'phoen'+'ici'+'a'='PHOENICIA'
'in' is the link.
(Other definitions for phoenicia that I've seen before include "Ancient land in Lebanon and 5 dn" , "Historic Middle East state" , "Middle Eastern region historically" .)