Timber houses get computer access, involving endless support around service initially (3,6)

'timber houses' is the definition.
(houses made from timber)

'endless support around service initially' is the wordplay.
'endless' indicates the central letters.
'support' becomes 'easel' (easel is a kind of support).
'around service' becomes 'logcabin' (I can't justify this - if you can you should believe this answer much more).
'initially' is a charade indicator (letters next to each other).
The middle of 'easel' is 's'.
's' put after 'logcabin' is 'LOG-CABINS'.

'get computer access involving' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.