Line up your deserving (6)
I believe the answer is:
worthy
'deserving' is the definition.
(similar in meaning)
'line up your' is the wordplay.
'line' becomes 'row' (a row or line of things).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'your' becomes 'thy' ('thy' historically meant 'your').
'row' reversed gives 'wor'.
'wor'+'thy'='WORTHY'
(Other definitions for worthy that I've seen before include "Notability" , "Deserving, meritorious" , "Meriting respect or esteem" , "Meriting respect or reward" , "Creditable" .)