Travelling into work introduces an alternative (6)
I believe the answer is:
option
'an alternative' is the definition.
(synonyms)
'travelling into work introduces' is the wordplay.
'travelling' becomes 'op' (I can't justify this - if you can you should give a lot more credence to this answer).
'work' indicates an anagram.
'introduces' means one lot of letters goes inside another.
'into' anagrammed gives 'tion'.
'op' placed within 'tion' is 'OPTION'.
Can you help me to learn more?
(Other definitions for option that I've seen before include "Something that may be chosen" , "Possible choice" , "Freedom to choose" , "Altenative choice" , "Choice, selection" .)