Shipyard features petticoat routines (8)
I believe the answer is:
slipways
'shipyard features' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
'petticoat routines' is the wordplay.
'petticoat' becomes 'slip' (I've seen this in another clue).
'routines' becomes 'ways' (I can't explain this - if you can you should give a lot more credence to this answer).
'slip'+'ways'='SLIPWAYS'
Can you help me to learn more?
(Other definitions for slipways that I've seen before include "where docks 4" , "From which boats are launched" .)