Cleaner turning to one for transport (7)
I believe the answer is:
chariot
'for transport' is the definition.
(chariot is a kind of transport)
'cleaner turning to one' is the wordplay.
'cleaner' becomes 'char' (charwoman is a type of cleaner).
'turning' says the letters should be written backwards.
'one' becomes 'I' (Roman numeral).
'to'+'i'='toi'
'toi' written backwards gives 'iot'.
'char'+'iot'='CHARIOT'
(Other definitions for chariot that I've seen before include "ride in carriage" , "American religious folksong 'Swing low, sweet ...'" , "former military vehicle" , "Ancient horse-drawn war vehicle" , "Two-wheeled horse-drawn vehicle used in battle" .)