  We present a detailed structural and gas kinematic study of the star-forming
complex W5-NW. A cloud-cloud collision scenario unravels with evidences of
collision induced star and cluster formation. Various signatures of cloud-cloud
collision such as "complementary distribution" and "bridging-features" are
explored. At the colliding region, the two clouds have complementary
morphologies, where W5-NWb has a filamentary key-like shape which fits into the
U-shaped cavity in W5-NWa that behaves like a keyhole. The interaction region
between the two clouds is characterised by bridging features with intermediate
velocities connecting the two clouds. A skewed V-shaped bridging feature is
also detected at the site of collision. A robust picture of the molecular gas
distribution highlighting the bridges is seen in the position-position-velocity
diagram obtained using the SCOUSEPY algorithm. Star cluster formation with an
over-density of Class I and Class II young stellar objects is also seen towards
this cloud complex, likely triggered by the cloud collision event.
