Tied up and with a job to be done inside (8)
I believe the answer is:
anchored
'tied' is the definition.
(thesaurus)
'up and with a job to be done inside' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'and' becomes 'n' (common abbreviation for 'and').
'with' means one lot of letters go next to another.
'job' becomes 'chore' (synonyms).
'to be done inside' becomes 'd' (I am not sure about this - if you are sure you should believe this answer much more).
'n'+'a'='na'
'na' written backwards gives 'an'.
'an'+'chore'+'d'='ANCHORED'
Can you help me to learn more?
(Other definitions for anchored that I've seen before include "Held securely in place like ship" , "unlikely to drift" , "Firmly fastened" , "Fixed a vessel to the seabed" , "Fixed in one place" .)