Part of submarine deceiving tug? (7,5)

I believe the answer is:

conning tower

'part of submarine' is the definition.
('conning tower' is part of 'submarine')

'deceiving tug?' is the wordplay.
'deceiving' becomes 'conning'.
'tug?' becomes 'tower' (I've seen this before).
'conning'+'tower'='CONNING-TOWER'

(Other definitions for conning tower that I've seen before include "Submarine observation post" , "Bridge of submarine when on the surface" , "Submarine's stack" , "Periscope seen here" , "Submarine's superstructure" .)

I've seen this clue in The Times.

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