Send first of the new trams in (8)
I believe the answer is:
transmit
'send' is the definition.
(synonyms)
'first of the new trams in' is the wordplay.
'first of the' becomes 't' (1st letter of 'the').
'new' indicates an anagram.
'trams'+'in'='tramsin'
'tramsin' is an anagram of 'ransmit'.
't'+'ransmit'='TRANSMIT'
(Other definitions for transmit that I've seen before include "Disseminate" , "Pass on (message)" , "Pass or hand on" , "Communicate (an idea)" , "Send from one person to another, or broadcast" .)