Main direction of the sick bay? (7)
I believe the answer is:
seaward
'the sick bay?' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'main direction' is the wordplay.
'main' becomes 'sea' ('sea' can be a synonym of 'main').
'direction' becomes 'ward' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sea'+'ward'='SEAWARD'
'of' is the link.
Can you help me to learn more?
(Other definitions for seaward that I've seen before include "heading for coast?" , "Towards the ocean" , "Like sailor going out" .)