Goose in farm building disturbed Alec (8)

I believe the answer is:
barnacle
Here is my best explanation:
'goose' is the definition.
(barnacle is a kind of goose)
'farm building disturbed alec' is the subsidiary indication.
'farm building' becomes 'barn' (barn is a kind of farm building).
'disturbed' indicates anagramming the letters.
'alec' with letters rearranged gives 'acle'.
'barn'+'acle'='barnacle'
'in' is the link.
(Other definitions for barnacle that I've seen before include "Marine crustacean (attaching to rocks, ships etc.)", "Sea creature - lean crab (anag)", "Crustacean attached to rocks", "A shellfish that sticks to hulls etc", "Hull resident (one who clings on)?", "Be carnal consuming this shellfish", "'Marine crustacean, attaches to a boat-hull (8)'", "Crustacean that adheres to ships' bottom", "Crustacean that attaches to submerged surfaces" and "Marine crustacean - European goose".)

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