'e's cleaner in second movie in particular (8)
I believe the answer is:
specific
'particular' is the definition.
(similar in meaning)
''e's cleaner in second movie' is the wordplay.
'cleaner' becomes 'cif' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'second' becomes 's' (common abbreviation).
'movie' becomes 'pic' (short for picture).
'e'+'cif'='ecif'
's'+'pic'='spic'
'ecif' put inside 'spic' is 'SPECIFIC'.
'in' is the link.
Can you help me to learn more?
(Other definitions for specific that I've seen before include "Clear and exact" , "Particular, distinct" , "Well-defined" , "Precise, clearly defined" , "Precise, not vague" .)