Curl up in front of the foreign tree house (6)
I believe the answer is:
nestle
'curl up' is the definition.
(thesaurus)
'in front of the foreign tree house' is the wordplay.
'in front of' says to put letters next to each other.
'the foreign' becomes 'le'.
'tree house' becomes 'nest' (I can't explain this - if you can you should give a lot more credence to this answer).
'le' after 'nest' is 'NESTLE'.
Can you help me to learn more?
(Other definitions for nestle that I've seen before include "Snuggle up closely to" , "Lie snugly (in a place)" , "Snuggle into, say, embrace" , "Lie safely" , "Settle comfortably (against something)" .)