Pecos area developed for advanced industry (9)
I believe the answer is:
aerospace
'advanced industry' is the definition.
(advanced field or industry)
'pecos area developed' is the wordplay.
'developed' indicates an anagram.
'pecos'+'area'='pecosarea'
'pecosarea' is an anagram of 'AEROSPACE'.
'for' is the link.
(Other definitions for aerospace that I've seen before include "The aviation world" , "rocket industry" , "Industry of flight" , "Nasa's speciality" , "zone near Earth" .)